Stair form



Dec. 29, 1942; P. F. Fox 2,306,722

' STAIR FORM Filed April 5, 1941 4 Sheets-Sheet 1 II. I

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Dec; 29, 1942. P. F. FOX 2,306,722

STAIR FORM Filed April 5, 1941 4 Sheets-Sheet 2 I PAUL F Fox',

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ec. 29, 1942. Fcjx 2,306,722

STAIR FORM Filed April 5, 1941 4 Sheets-Sheet 4 PAUL F1 Fox,

Patented Dec. 29, 1942 UNITED STATES PATENT OFFICE STAIR FORM Paul F.Fox, Silver Spring, Md.

Application April 5, 1941, Serial No. 387,081

7 Claims.

This invention relates to new and useful improvements in stair forms andmore particularly to a form which can be adjusted to varying stair jobsand architectural specification.

The most important object of the invention is to provide a form which iseasily adjustable to permit the convenient forming of steps both inrespect to their rise and run in a very convenient manner, thusconserving on skilled assistance substantially, and alleviating to alarge extent the waste of materials which now occurs by reason of theuse of lumber which quickly deteriorates and is easily damaged whenknocking down form structures.

Another object of the invention is to provide a stair form which can bereadily set up and which will sturdily remain in place while theconcrete is being finished and under sundry other adverse conditions.

Still another object is to provide a form of the character stated whichcan be easily set up and knocked down, and much more so than thespecially measured and cut wood type now being generally used.

A further object of the invention is to provide a stair form whereinrisers are provided capable of both vertical and longitudinal extension.

Various other important objects and advantages of the invention willbecome apparent to U the reader of the following specification.

In the drawings:

Figure 1 is a top plan view.

Figure 2 is a side elevational view showing the bulkhead removed toclarify the extent of the invention.

Figure 3 is a fragmentary side elevational view showing the form beingused to form risers of the set back design.

Figure 4 is a perspective view of one of the risers, shown assembled aspartly extended.

Figure 5 is a perspective View of the right unit of the riser assembly.

Figure 6 is a longitudinal sectional view through one of the assembledrisers.

Figure 7 is a vertical sectional view through one of the risers showingin dashed lines that the same is vertically adjustable, and further thatit may sit upon a sofiit supported chair.

Figure 8 is an enlarged vertical sectional view showing a speciallyconstructed sofit supported chair and retaining means for the risers.

Figure 9 is a perspective view of one of the chairs.

Referring to the drawings wherein like nu- 55 merals designate likeparts, it can be seen that two or more stringers 5, 5 of channeledconstruction are employed and the inclination of these channeledstringers 5, 5 is determined by blocks 6 and i upon which the upper andlower ends of the stringers rest at the upper and lower levels 8 and 9,respectively.

The stringers 5 are formed with staggered rows of slots it, as isclearly shown in Figure 2 and these slots serve to accommodate bolts IIwhich pass through longitudinal slots l2 in certain flanges of angularlegs 13, each of these legs i3 being provided at its lower end with anoblique lip H1.

The purpose of the legs I3 is to desirably support the risers generallyreferred to by numeral I5. These risers iii are each of telescopicconstruction, and capable not only of longitudin'al extension, but alsoadjustability in width. Figure 4 shows one of the riser assemblies, theletter A denoting the left unit while the letter B denotes the rightunit.

It can be seen that each of the units has approximately the same crosssectional configuration. That is to say, and drawing attention to Figure5, that each unit has an inclined bottom and a substantially flat top,and a rise forming side which is as smooth and uninterrupted as isphysically possible in a telescopic structure.

As can be seen in Figure 4, the unit A consists of an upper section l6and a lower section I1. One end of each of these sections l6 and H hasan outwardly bent end wall portion, these portions being denoted byreference characters I8, and as is clearly shown in Figure 4, the endwall l8 has a portion I80. bent to overlap the free vertical edgeportion of the end wall I9. Thus the end walls l8 and IQ of the sectionsl6 and i! are slidably united.

The section l6 has a top which extends outwardly, downwardly as at 2|and inwardly as'at 22 (see Figure 7). The section I1 has a slantingbottom 23 which at its outer edge ex-' tends upwardly as at 24 andinwardly as at 25 (see Figure 7).

The unit B, shown by itself in Figure 5, is of like cross sectionalconfiguration, the same having a flat top 26 and a slanting bottom 21.Further, the unit B is constructed of a pair of sections 28 and 29, eachhaving an end wall 30,

3E; with the end wall 30 provided with an inwardly bent lip 32overlapping the end wall 3|, to the end that the sections 28 and 29 areslidably united and this is further taken care of by the provision of aninwardly bent lip 33 on Each of these vertically adjusting devicesconsists in the provision of a bracket 35 extending from the portion 25of the section IT, or the section 29 in the case of the unit B, to thefront wall of the section (see Figure 7). On this bracket 35 is a boss36 having a threaded bore therethrough for receiving a threaded shaft 31the upper end of which is rotatably or swivelly disposed through aformation 38 located on a bracket 39 extending inwardly from the portion22 of the section 5 or the portion 48 of the section 28, in the case ofthe unit B. The intermediate portion of the shaft 3'! is provided with apolygonal formation 31a which can accommodate a wrench or other toolwhen the shaft is to be rotated to vertically adjust the section.

' As can be seen in Figure 4, the adjusting device to the right in unitB and the adjusting device in the unit A have means associated therewithfor attachment to the legs |3. That is, the upper and lower bosses orformations 38 and 36 are provided with outwardly disposed and threadedmembers 4|, these members being disposed through openings in the legsand provided with nuts 42.

In substantially long risers, or in every instance if desired, the lowersection 29 of the unit Bmay be vertically slotted as at 43 and a lug 44struck fromthe section 28, disposed through the slot 43 and bentlaterally as shown in Figure 5, thus affording an additional slideconnection. Corresponding means 45 may be provided on the unit A.

Due to' the fact that the aforedescribed structure would obviously belifted by the action of c-ncrete poured in the carriage, since therisers are not nailed to the carriage as is conventional, supporting andretaining means are provided and clearly shown in Figure 8.

Figure 8 discloses a vertically disposed chair 46 having a V-notch 41 atits upper end defining a seat for the acute angularly-shaped lowerportion of the corresponding riser [5. The lower end of the chair 46 isprovided with a laterally disposed and apertured flange 48, through theapertures of which nails 49 can be driven into a soifit 58 or otherstructure. Thus the risers are afinded proper support and this isespecially des rable in view of the retaining means which will now bedescribed.

The retaining means also encompasses a method. The structure of theretaining means consists of an elongated tie rod 5| having its endsthreaded. This tie'rod has a waxed tube, preferably of paper,surrounding the same and this tube is denoted by a numeral 52. As can beseen in Figure 8, one end of the tie rod 5| is disposed through theaperture of the oblique lip M on the lower end of the corresponding leg|3 while the lower end is disposed through an opening 53 in the chairflange 48 and through an opening in the soifit 59. As can be seen inFigure 8, the upper and lower ends of the tie rod 5| are provided withnuts 54 and 55. The waxed tube 52 extends entirely from the flange 48 toan upper point on the rod sufficiently high to clear the concrete andprevent possible adhesion of the concrete with the rod 5|.

The method is of course to first set up the stringers 5, arrange thechairs 46 and properly set the risers in respect thereto. Subsequentlythe waxed tubes 52 are interposed between the lips l4 and the flanges 48of the chairs 46 and the rods 5| with nuts 54 at their upper ends forceddownwardly through the lips l4 and tubes 52 and passed through theflange 48 of the chair 46 and the soffit 50. A nut 55 is then placed onthe lower end of each of the rods 5| and the nuts 54 and 55 tightened tothe desired extent. When the apparatus is to be removed, one of the nuts54 or 55 can be removed and the rod easily pulled through the waxedtube. This obviously eliminates the necessity of cutting ofi anyprotruding rods which requires considerable time and runs into expense.

As can be seen in Figure 3, the legs |3 can be set angularly so that therisers are on an incline when it is desired to form set back risers.

Obviously, the purpose of having the elongated slots in the stringers 5and the risers vertically adjustable is so that treads and risers of thesteps to be constructed may be formed according to specificationswithout requiring to any extent the measuring and cutting of lumberspecific to the run and rise of the steps. This is all taken care of byquickly manipulatable adjusting means.

The present invention also contemplates the convenient moving of thisapparatus from job to job with but a minimum expense in upkeep.

While the foregoing specification sets forth the invention in specificterms, it is to be understood that numerous changes in the shape, sizeand materials may be resorted to without departing from the spirit andscope of the invention as claimed hereinafter.

Having described the invention, what is claimed as new is:

1. In a concrete stair form, a riser forming unit consisting of a pairof hollow telescopically assembled sections each having a slantingbottom construction slanting in a direction to afford clearance over theentire tread surface of an underlying step to be finished.

2. A concrete stair form comprising a stringer, a plurality of stepriser forming units and a soflit form supported chair supporting saidriser forming unit spacially above the soflit form.

3. A concrete stair form comprising a stringer, a plurality of stepriser forming units and a soflit form supported chair supporting saidriser forming unit spacially above the soffit form, and soflit attachedholding means in connection with said units.

4. A concrete stair form comprising an elongated stringer, step riserdefining units carried by the stringer, a soflit form supported chairfor certain of the units, and sofiit attached tie means holding saidcertain units upon their chairs.

5. A concrete stair form comprising an elongated stringer, step riserdefining units carried by the stringer, a soffit form supported chairfor certain of the units, and soflit attached tie means holding saidcertain units upon their chairs, said tie means consisting of a tie rodand a concrete impervious tube surrounding the same and through whichthe rod can be pulled.

6. A concrete stair form comprising an elongated stringer, step riserdefining units carried by the stringer, a soifit form supported chairfor 1 7. In a concrete stair form, riser forming units, certain of theunits, and soffit attached tie means each unit having a beveled lowerportion disholding said certain units upon their chairs, posed in adirection to aiTord clearance over the said tie means consisting of atie rod and a conentire tread surface of an underlying step to be creteimpervious tube surrounding the same and 5 finished. through which therod can be pulled, said chair PAUL F. FOX.

having a portion 'formed with an opening through which the tie rodextends.

